Vulnerability · Published Sep 5, 2025 · Assigned by GitHub_M
CVE-2025-58369fs2: Half-shutdown of socket during TLS handshake may result in spin loop on opposite side
Medium 5.3
In plain English
A medium-severity uncontrolled resource consumption in fs2 from typelevel. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 41% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
fs2 is a compositional, streaming I/O library for Scala. Versions up to and including 2.5.12, 3.0.0-M1 through 3.12.2, and 3.13.0-M1 through 3.13.0-M6 are vulnerable to denial of service attacks though TLS sessions using fs2-io on the JVM using the fs2.io.net.tls package. When establishing a TLS session, if one side of the connection shuts down `write` while the peer side is awaiting more data to progress the TLS handshake, the peer side will spin loop on the socket read, fully utilizing a CPU. The CPU is consumed until the overall connection is closed, potentially shutting down a fs2-io powered server. This issue is fixed in versions 2.5.13, 3.12.1, and 3.13.0-M7.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Maven | co.fs2:fs2-io_0.26 | no fix listed | GHSA-rrw2-px9j-qffj |
| Maven | co.fs2:fs2-io_0.27 | no fix listed | GHSA-rrw2-px9j-qffj |
| Maven | co.fs2:fs2-io_2.11 | no fix listed | GHSA-rrw2-px9j-qffj |
| Maven | co.fs2:fs2-io_2.12 | 3.12.2 | GHSA-rrw2-px9j-qffj |
| Maven | co.fs2:fs2-io_2.12 | 3.13.0-M7 | GHSA-rrw2-px9j-qffj |
| Maven | co.fs2:fs2-io_2.12 | 2.5.13 | GHSA-rrw2-px9j-qffj |
| Maven | co.fs2:fs2-io_2.12.0-M4 | no fix listed | GHSA-rrw2-px9j-qffj |
| Maven | co.fs2:fs2-io_2.12.0-M5 | no fix listed | GHSA-rrw2-px9j-qffj |
| Maven | co.fs2:fs2-io_2.12.0-RC1 | no fix listed | GHSA-rrw2-px9j-qffj |
| Maven | co.fs2:fs2-io_2.12.0-RC2 | no fix listed | GHSA-rrw2-px9j-qffj |
| Maven | co.fs2:fs2-io_2.13 | 3.13.0-M7 | GHSA-rrw2-px9j-qffj |
| Maven | co.fs2:fs2-io_2.13 | 2.5.13 | GHSA-rrw2-px9j-qffj |
| Maven | co.fs2:fs2-io_2.13 | 3.12.2 | GHSA-rrw2-px9j-qffj |
| Maven | co.fs2:fs2-io_2.13.0-M5 | no fix listed | GHSA-rrw2-px9j-qffj |
| Maven | co.fs2:fs2-io_3 | 3.13.0-M7 | GHSA-rrw2-px9j-qffj |
| Maven | co.fs2:fs2-io_3 | 2.5.13 | GHSA-rrw2-px9j-qffj |
| Maven | co.fs2:fs2-io_3 | 3.12.2 | GHSA-rrw2-px9j-qffj |
Affected products (as reported)
Weakness: CWE-400 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
References
- https://github.com/typelevel/fs2/security/advisories/GHSA-rrw2-px9j-qffj x_refsource_CONFIRM
- https://github.com/typelevel/fs2/issues/3590 x_refsource_MISC
- https://github.com/typelevel/fs2/commit/46e2dc3abf994dcf3d0b804b2ddb3c10c04d4976 x_refsource_MISC
- https://github.com/typelevel/fs2/commit/5c6c4c6c1ef330f7e6b53661ecc63d5f5ba8885c x_refsource_MISC
- https://github.com/typelevel/fs2/commit/edf0c4f2e660360d1c1a8c5377ce32294de89238 x_refsource_MISC
- https://github.com/typelevel/fs2/releases/tag/v3.12.2 x_refsource_MISC
- https://github.com/typelevel/fs2/releases/tag/v3.13.0-M7 x_refsource_MISC